Cut-out for electric circuits.



N. J. CONRAD. Y cumin Fon` mimmo CIRCUITS.

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APPLICATION FILED IUNE 4 i917.`

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N. :.fxmm).l CUT-OUTfOR ELECTRIC CIRCUITS.

' l' :I APPLICATION FILED IUIIE, I'SIT.. V 1 1,254,886, Patented 1m29, 1918.

2 SHEETS-SHEET 2- 'are ofconsidcruble capacity, has alwaysheen NICHOLAS I. comen, or cHIcAc' o, ILLINOIS, AsIGNon'To "scnnIIzEn.&.connD 'oF CB1-CAGO, ILLINoIs, A comcaa'rmx or ILLIIajoI` cUar-o'u'r Fon. ELEcTnIc' CIRCUITS.

To alla-'cham it may' concern; "i l i* Be it known that 1, NIcHoLas J. CONRAD,

-a citizen of the UnitcdaStates, residing a-t Chicago, in the county of Cook and State of l'llinqis,flxa vc invented alcertain nep' and useful .Improvement in Cut-Outs. forA Electic Circuits', of-.which the-,following is a full, .clcar; concise, and exact description,- r Inference v1o,

ing had tothe" accompanying drawings, forming' apart of this'4 specification.

-A `My invention rclatcslc cut-outs forelecgtric'circuts .1 I.

.The discomiection -of-'transformers -or cir#- cuits 'carrying 1109115 especially where the .same 4 yAt,thelowenlsendmfftli Y coat-member 13 is'zmountediandlexib Iductors .14 -and 15 {having-Suitable @terminals a diicult 'fproblcx'rn On systems' operating I g on-a voltagejas low. asv-1000v voltsjdisconnec- My invention a:

ingajesistance In series with the .circuit to AVillustrated the' mannerin-4 which. my inverni' ;..tion.may.be embodiedin a practical operadisco ectedbefore actually breaking the the type shownin niv copcndingapplical.

Flg. 3"is a frontelevational AView vof the..l disconnecting plug and.- the mounting orhandle for the .sa-me; and

Fig. 4 isa front elevation 'partly in sec tion illustrating the application of my in-A vention' to a pot head.

The fused cutfout shown in Fig. 1 is of tion, Serial No. 56,17?, filed @ctobcr 16th,

1915. According to my present invention I substitute for the fuse in this device u special disconnecting link as will now be de scribed in detail. The cut-ont shown in Fig. 1 comprises a. main sleeve'o insulation 1 which is {wm-ideal on its interior with anV tiveiy, us shown in Fig. 1. These spring slotting the#v 'samej axiallvl il' violently blown'- the-toi? 'l adapted to esfcapelthroughf-suitab efholee' .formed in the-uppexwva`ills offthemaixrele'ev gl. The upperpendofrthetubeioreleeve.

, @einem of nach may. Patented Jar-1.2911918.

Application lcd .Tune 4, 1917. Serial 110.172.624..

fingere are; formed-l byjredlicng-.the diameter .A of. the annular contacts 2 andl3- type developed. jointlya-.b

upper annular tcrminafl'SfWhei-.the l.

.is-adaptedimiie-:r .1.,- suchf. .eis

-lcve the pressure: w'thunf coat 12 ovetlthefopenin'gs.

are connectedtofthe.fcontacts2afndrz--h let out undcr-theipettxcoate:-12-5andelg -A moimtin memben ,17:having"fahandl own "at 23.

'. or' anydesired-vsuppoI-'t'H l.

, if/ According-tomy resent inventionli'pro- 'f90 1 -vide elink-2511s.

is formed in the shapefof a. short cylinder or' .plug 'havin a body constructed'of aslecve,

l2b of insu'ation2 preferably ber limpreglterminal, as will be explained later.

The terminai 2 is connected by a heavy 110 conductor of` low resistance preferably a cop r bar 31 to the cap 29 at the other end .of t e sleeve. The rin' 30 is connected to the terminal 27 throu li the medium of a to a line or bus. A pot-neau may also be employed vfor disconnecting or sectionalizing a line, as is well understood by 'those skilled in the art.

resistance rod 32. T is rod comprises a hi h-resistance of relatively great capacity. *It 1s preferably formed of clay and carbon. Such resistances are well known in the art and lmay b e purchased in the market. The

lower terminal 29 is provided with a stud 33 The connection that I have sh'own comprises an outer member of insulation 45, and an inner member of insulation 46, which is adapted to enter the outer member. The outer member 45 is providedwith bayonet for securing the lug. upon the mounting 17. The'operation OF the device is aslfollows:

The plug`25 is secured to the mounting 17 und'is inserted into the stationary member l of the cutout, as shown in Fig.' 1. The ring 30 engages thetermnal B- as the plug is insei-ted land the terminal27 then engages the stationary contact 2 so that the circuit lis first l'made through the resistance rod 32. As the v1plug is then Afarther inserted and the mountingfis secured by means of the pins and the bayonet-s1ot,"not; shown, the circuit will be closedI from contact 2, terminal 2 7, through [the copper bar 3'1, terminal29 and the contact'. When-itis desired to open-the cir- 4cuit ev'en thoughv the Vsame is carrying curslot 46 and the inner member 46" is provided with pins 47 cooperating with the bayonet slot 46 to hold the two parts together. A

The outer member contains the terminal 48 which is connected tothe disconnecting plug 49 of substantially the'same construe` tion as the plug 25 shown in Figs. 2Land 3. The inner member 46 contains a terminall 50 Vhaving a'spri'ngcontact `soclretfl` adapted to engage the lower terminals 52 "and 53 of the link or. disconnectingr unitv49. The uplper terminal 54; of the.d1sconnecting 'unitfor link 49 is connected to the terminal 48.' -This terminal 5t is connected through a"`resist4 ance rod 55 to thelwer terminal 52,'and is connected through the copper'bar 56 to the ring 53. The terminal socket 51 is made resilient by slotting the 'sainefaxially,fas' is shownL and this socket is held against axial displacement by a ring 57 which is held by the screws 58. It can be seen that when the 95 twommembera namely, the'outer member 45 and the inner member 46, are brought'to-A gather, the lower terminal 52l will make contact with the socket terminal 51 so that the initial ow of current will be through 5 appar cuit is bro en so that any 'current which to form an arcris limited by t' e resistance 32.

Such arcmaybe easily'bro enf'and disconnection is relatively easy.

- `40 lThe resistancie nod32 has a' metallic cap The upper cap l or terminal 34 at each end. I'

' is connected to the terminal 27 by means of a .spring clip 35 which has a lug-extending from the edge thereof through an aperture 45. 36 in thefsidewalls of the s'lwleeve 26 into contactfwith the temnal27Qi The lower cap 34 restsinV a. metallic socket 38 which 'is con nected to the ring 30 by means of a screw 39 which passes through the side wall of the Bofsleeve 26.

' 'Ihecopper rod 31 is connected at its lower -end to the metallic'cap 29 as by means of the screw 40 and atits upper end. vthis rod passes through an opening inthe side walls of the t5 shell and isgonnectedfto the terminal 27 by means o'f the screw 41. In ig. ,4 I have shown the coperating partsof ,a pot-head embodying my inven- .pot-head of this type comprises in general a,'separable cable connection and is used for' instance where a lead covered cable joins another cable, either ano her lead'covere'd cablefuan aerial cable, where a piece of s such as a transformer is connected the resistance rod 55. Thereafter the terminal socket 51 will engage the ring 53 and circuit will be made through the copper bar 56: When the two parts are'disconnected, the ring 53 will'be disengaged from the -Socket 51 and the terminal 52 will remain in contact with said terminal socket 51 so that the flow of current is reduced by the resistance 55. lVhen these parts are then completely separated, any are which might .hej drawn'will be limited by the resistance 55 vand will be readily extinguished.

It will be understood by, those skilled a.

the artthat the particular arrangement of parts to get this effect, namely, the insertion' 11: of thel resistance in circuit, just prior to andl at the time of breaking "the connection, may

be varied without departing from my in' vention. In the form shown in .Ejgsal tdi@ -the plug 25 moves With'respecbto both stas tionary terminals 2 and Bwhilin the-,forja shown in Fig. 4' the resistance plxg flg'irieves' only with respect to.4 the :spring socket termgI nal 51. Bothfoifthese forms aejbut diierent expressions ot the same inventive idea.

Iclaim'i l 1. In a cut-out, a tubular member of'jinsulation having a relatively stationa therein for connecting to one side o the line,

a.- coperating plug a-pairgof contactV Latelinel .rilatively' .movable contacts. for

said relatively stationary contact inean'son said plug for connecting to the other side of the lmenaflconductor of low resistance be- -5 tweensald means and one of-sa'id'pair of.

relatively movable-contacts and a high resst'anc'e ,coriductor connected between said' l otherA of said pair of relav 'tivelymovablecontacta e 2. -In combination, a socket member andra..

means and the coperatinge plugumembergsaid socket and plug mem rs ,having contacts for making connection between parts of a line, said plug meinbera hollow sleeve'having a pairfof circular .contacts, a conductorof' ',-lvow\resistance connected between one of er of contactsa'nd theline, anda relativel resistalnc'e 'connected between the -ot said pair .ofcontacts and said line,"sad` high resistance being connected in circuitbetween said parts of 't eline at the momentthat the line 1s disconnected or connected 3. a cut-out, a disconnecting plug,r com- -prsing a'sleeveofinsulation, a terminal at .one'end adapted to be connected to one side 'of a line, a pail-of terminals at the other end o f said sleeve, a 'relativelystationary contact adapted t be connected-to thel other side of line for engaging said pair of terminals, a resistance connected in'said sleeve and.

extending 'between said first terminal and -one of said pair of terminals, and a conductor of low resistance between said first terminal and the other of ,s aid. pair of termnals.

. 4. In combination, a sleeve of insulation, a' metallic terminal at euch end of said sleeve, a metallic rin 'lying on the outside surface of said sleevee .tallic 'conductor of low resistance connected tween said. terminals, a mebetween the terminals and a conductor of relatively high resistance connected bet-Ween' one terminal and said ring. t

5. A tubular sleeve of insulation, a circular metallic terminal at each end of said "sleeve, a circular metallic terminal lying on said-sleeve between said-,end terminals, a low resistance connection between one v end terminal 'and another fterminal and ahigh resistanceconnection between said oneA end terminal and the remaining'l terminal.

my namefthis 1st day 'of June, A. D'. 1917. NICHOLAS J. CONRAD.

In witness whereof I hereunto subscribe 

